Modernize the Hibernate example if it's possible on the current version #1680

After our example migration to a separate project and splitting into separate projects, we probably could obtain the possibility to have a modern and up-to-date Hibernate example

• check the possibility of migration to 7.+ Hibernate version in the particular project
• learn the best modern practices and share some references
• move from XML configs to the code configs
• research possibility to improve DataFrame construction from @Entity object
• don't forget to update documentation around this sample (could use LLM)